Smardale Gill viaduct was built by Mr Wrigg, a contractor from Preston, for £11,298. Constructed of locally quarried limestone, its 14 arches carried the Barnard Castle to Tebay line for 184 yards over the valley. Built for double track, it never carried more than a single line. By the 1990s, the viaduct had fallen into disrepair and British Railways Board wanted to demolish it but the cost was prohibitively high so it was restored and is now part of a footpath.